Neck Compartments and Triangles

A bundle of nerves that supplies the upper limb, formed by the spinal nerves from C5 to T1.

The space inside the nose, divided into two halves by the nasal septum. Each half contains a roof, floor, medial wall, and lateral wall.

The bony roof of the mouth. It is continuous with the soft palate.

The muscular part of the roof of the mouth that hangs down in the back.

The vertical wall separating the two halves of the nasal cavity.

Three bony projections on the side walls of the nasal cavity that increase the surface area.

Air-filled spaces in some skull bones that connect to the nasal cavity. They include the frontal, sphenoidal, ethmoidal, and maxillary sinuses.

A tube that connects the middle ear to the nasopharynx, allowing pressure equalization.

A muscular tube that starts at the base of the skull and ends at the esophagus. It connects the nasal cavity, oral cavity, and larynx.

A flap of cartilage that covers the opening of the larynx during swallowing, preventing food from entering the airways.

The superficial muscular compartment of the neck is enclosed by a layer of fascia called the investing fascia. This compartment houses several muscles, including the sternocleidomastoid and trapezius, which are responsible for head movement and neck support.

The visceral and vascular compartments of the neck contain structures like the thyroid gland, larynx, and pharynx. They are surrounded by the pretracheal fascia, which acts as a protective layer.

The carotid sheath is a tube of fascia in the neck that encloses the common and internal carotid arteries, the internal jugular vein, and the vagus nerve. These structures work together to deliver blood and control vital functions.

The deep muscular compartment of the neck is enveloped by the prevertebral fascia and contains muscles that support the spine and neck movement. It also houses the cervical plexus, a network of nerves that control sensory and motor functions in the neck and head.

The sternocleidomastoid muscle is a large, prominent muscle in the neck that connects the sternum and clavicle to the mastoid process of the skull. It is responsible for head rotation and flexion.

The trapezius muscle is a large, triangular muscle that covers the back of the neck and shoulders. It is responsible for shoulder elevation, retraction, and depression.

The thyroid gland is a butterfly-shaped endocrine gland located in the neck, responsible for producing hormones that regulate metabolism.

The trachea, also known as the windpipe, is the tube connecting the larynx to the bronchi. It's the passageway for air to and from the lungs.